MIMO midamble sequence proposal (AWD-15.3.5) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09/1313 Date Submitted:

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MIMO midamble sequence proposal (AWD ) IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09/1313 Date Submitted: Source: Huaning Niu, Alexei Davydov, Yuan Zhu, Jiacheng Wang, Yuval Ayelet Doron, Gregory Morozov, Yang-seok Choi, Guangjie Li Qinghua Li Intel Corporation Venue: IEEE m Session#62, San Francisco, USA Category: AWD comments / Area: Chapter (DL-PHY) “Comments on AWD (UL-PHY)” Base Contribution: IEEE C80216m-09/1313 Purpose: Discussion and approval Notice: This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

Highlight of Mid-amble Design Reuse-1 mid-amble Mid-amble frequency structure –Tone rotation per sub-band to avoid periodicity per antenna Mid-amble sequence –Golay Hadamard sequence –2dB boosting Mid-amble position –Fixed second sub-frame to allow enough time for MS processing

Midamble Frequency Structure Mid-amble should avoid similar structure as 16m P-preamble and 16e preamble –Low mis-detection is both auto-correlation type receiver and cross-correlation type receiver –Work with any channel statistics Solution: Tone rotation per sub-band to avoid periodicity per antenna

Midamble Signal Time domain midamble waveform MIMO midambe subcarrier modulating symbols

Golay Sequence subband specific antenna rotation segment/cell specific offset for interference averaging offset to minimize PAPR s = 0, for k≤(N used -1)/2 s = 1, for k>(N used -1)/2

MIMO Midamble Physical Structure

Golay Sequence (Cont’d)

Golay: Partial Cross-Correlation Performance u = 0,1,2,…,127 2TX antenna4TX antenna

Mid-amble Evaluation Tb/2 autocorrelation per antenna –Avoid similarity to 16m P-preamble per antenna Cross-correlation with 16e preamble and 16m P-preamble PAPR mid-amble sequence

Midamble Tb/2 per-antenna Auto- correlation, 2Tx, FFT=512

Midamble Tb/2 per-antenna Auto-correlation, 4Tx, FFT=512

Midamble Tb/2 per-antenna Auto-correlation, 8Tx, FFT=512

Cross-correlation: Midamble x 16e preamble, 2Tx, FFT=512

Cross-correlation: Midamble x 16e preamble, 4Tx, FFT=512

Cross-correlation: Midamble x 16e preamble, 8Tx, FFT=512

Cross-correlation: Midamble x 16m PA-preamble, 2Tx, FFT=512

Cross-correlation: Midamble x 16m PA-preamble, 4Tx, FFT=512

Cross-correlation: Midamble x 16m PA-preamble, 8Tx, FFT=512

Golay: PAPR Performance Performance with per subband antenna rotation Performance without per subband antenna rotation

Summary Proposed mid-amble structure support good MIMO channel estimation for cell center and cell edge user –Good multi-cell BS MIMO support Low mis-detection of 16m P-preamble and 16e preamble Low PAPR sequence to allow mid-amble boosting